IMAGINE Discussions

Discuss and share topics of interest using ERDAS IMAGINE the world’s leading geospatial data authoring system.
Showing results for 
Search instead for 
Do you mean 
Reply
Highlighted
Technical Evangelist
Posts: 27
Registered: ‎11-16-2015
Accepted Solution

Georeferencing old maps (Affine transformation)

One of my customers is doing several test for georeferencing (old images that before were referenced with Iras/C)

 

This is what he says:

 

Imagine provides several possibilities. Affine calibration leads to a dialog whose variables aren’t what we expected: rotation – reflection.

 

I found it as a not straightforward concept…thus the question into a tutorial 😊

 

In theory, there’s a method to aply a georeferenced image into a map grid.

 

 

 

 

 

 

This is an example

 

 

 

Can you advise the easiest way to do this in IMAGINE?

Highlighted
Staff
Posts: 10
Registered: ‎10-09-2015

Re: Georeferencing old maps (Affine transformation)

Affine calibration doesn't do georeferencing. Using Control Points tool in Transform & Orthocorrect Group (visible when an image is displayed in Viewer or you could search for it under Help tab), the old map could be georeferenced via Polynomial or other 2D model based on control points. 

Highlighted
Technical Evangelist
Posts: 970
Registered: ‎10-01-2015

Re: Georeferencing old maps (Affine transformation)

Here's a link to the tutorials which show you how to use the GCP editor:

 

https://hexagongeospatial.fluidtopics.net/reader/fH0o7KrMKUViXGUeoilQuA/M6n3XuQ5F1ajIawy2w12eQ

 

Hope that helps.

 

Cheers

 

 

 

Ian Anderson
Chief Product Owner, Desktop Remote Sensing
Hexagon Geospatial